SN54HCT273, SN74HCT273

OCTAL DTYPE FLIPFLOPS

WITH CLEAR

SCLS068E − NOVEMBER 1988 − REVISED AUGUST 2003

4

POST OFFICE BOX 655303

timing requirements over recommended operating free-air temperature range (unless otherwise

noted)

VCC

TA = 25°C

SN54HCT273

SN74HCT273

UNIT

VCC

MIN

MAX

MIN

MAX

MIN

MAX

UNIT

fclock

Clock frequency

4.5 V

25

16

20

MHz

fclock

Clock frequency

5.5 V

28

19

23

MHz

CLK high or low

4.5 V

20

30

25

tw

Pulse duration

CLK high or low

5.5 V

18

25

22

ns

tw

Pulse duration

CLR low

4.5 V

16

24

20

ns

CLR low

5.5 V

14

20

17

Data

4.5 V

20

30

25

tsu

Setup time before CLK

↑

Data

5.5 V

17

25

21

ns

tsu

Setup time before CLK

↑

CLR inactive

4.5 V

20

30

25

ns

CLR inactive

5.5 V

17

25

21

th

Hold time data after CLK

↑

4.5 V

0

0

0

ns

th

Hold time data after CLK

↑

5.5 V

0

0

0

ns

FROM

TO

SN54HCT273

PARAMETER

FROM

(INPUT)

TO

(OUTPUT)

VCC

TA = 25°C

MIN

MAX

UNIT

PARAMETER

(INPUT)

(OUTPUT)

VCC

MIN

TYP

MAX

MIN

MAX

UNIT

fmax

4.5 V

25

31

16

MHz

fmax

5.5 V

28

37

19

MHz

tpd

CLR

Any

4.5 V

15

34

50

ns

tpd

CLR

Any

5.5 V

12

29

42

ns

tPHL

CLR

Any

4.5 V

17

15

50

ns

tPHL

CLR

Any

5.5 V

15

34

42

ns

tt

Any

4.5 V

8

18

22

ns

tt

Any

5.5 V

7

19

21

ns

FROM

TO

SN74HCT273

PARAMETER

FROM

(INPUT)

TO

(OUTPUT)

VCC

TA = 25°C

MIN

MAX

UNIT

PARAMETER

(INPUT)

(OUTPUT)

VCC

MIN

TYP

MAX

MIN

MAX

UNIT

fmax

4.5 V

25

31

20

MHz

fmax

5.5 V

28

37

23

MHz

tpd

CLR

Any

4.5 V

15

34

42

ns

tpd

CLR

Any

5.5 V

12

29

36

ns

tPHL

CLR

Any

4.5 V

17

34

42

ns

tPHL

CLR

Any

5.5 V

15

29

36

ns

tt

Any

4.5 V

8

15

19

ns

tt

Any

5.5 V

7

14

17

ns

PRODUCT PREVIEW information concerns products in the formative or

design phase of development. Characteristic data and other

specifications are design goals. Texas Instruments reserves the right to

change or discontinue these products without notice.